From: joro@8bytes.org (Joerg Roedel)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/2] iommu: Implement a dummy bus_set_iommu()
Date: Wed, 22 Oct 2014 16:29:22 +0200 [thread overview]
Message-ID: <20141022142922.GH10074@8bytes.org> (raw)
In-Reply-To: <20141015091043.GA13162@ulmo>
On Wed, Oct 15, 2014 at 11:10:44AM +0200, Thierry Reding wrote:
> It seems like I never got back to you on this. The reason here is that
> for Tegra the IOMMU is part of a larger IP block. The IP block is
> primarily a memory controller with a bunch of configuration knobs for
> arbitration, prioritization and whatnot. A smaller part of the device
> does the IOMMU translation. Therefore the IOMMU implementation would
> be part of a larger driver, and having this dummy would reduce the
> amount of #ifdefs required.
>
> bus_set_iommu() is also the only function in include/linux/iommu.h that
> doesn't have a dummy, so it seemed like a natural thing to do.
>
> That said, I can work around this being absent for !IOMMU_API.
Or you make this "larger driver" just depend on IOMMU_API? Otherwise you
need the #ifdefs anyway to not carry around the iommu-ops functions in
the driver without having the iommu core enabled, no?
Joerg
next prev parent reply other threads:[~2014-10-22 14:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-01 12:45 [PATCH 1/2] iommu: Always define struct iommu_ops Thierry Reding
2014-08-01 12:45 ` [PATCH 2/2] iommu: Implement a dummy bus_set_iommu() Thierry Reding
2014-08-18 16:57 ` Joerg Roedel
2014-10-15 9:10 ` Thierry Reding
2014-10-22 14:29 ` Joerg Roedel [this message]
2014-10-23 8:09 ` Thierry Reding
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